(CNN)Syrian rebels are suspending talks in the lead-up to planned peace negotiations due to what they call "Syrian regime violations" of a four-day-old nationwide ceasefire agreement.
Why are rebels threatening to boycott talks?
Does it matter if the rebels don't show up for talks?
How powerful are the rebels who were invited to the talks?
- Ahrar al Sham, though it has not agreed to take part and appears to be split
- Jaysh al Fatah (the Army of Conquest), a shifting alliance which has been a player in Idlib and Aleppo
- Suqour al-Sham, which fired on regime positions near (NEAR) Idlib Monday
- Turkish-backed FSA elements, which are now battling ISIS north of Raqqa
- Jabhat Fateh al-Sham (formerly Jabhat al-Nusra), which has endured despite massive bombardment of Idlib and Aleppo
- ISIS, which still controls large parts of northeastern Syria, its self-declared capital of Raqqa, and is active elsewhere
- The Kurdish YPG, which controls a swathe of northern Syria bordering Turkey